Conventional Ni/yttria stabilized zirconia (YSZ) fuel electrode supported solid oxide electrolysis cells (SOECs) demonstrate acceptable long-term durability when operated at below -1 A/cm2. These cells suffer however severe degradation at above -1 A/cm2, where a large part of the cell resistance increase is associated with the Ni/YSZ electrode. In this work, by introducing Ce0.8Gd0.2O2-δ (CGO) nanoparticles into the Ni/YSZ electrode, we reduce the cell degradation down to 39 mV/kh when operated at 810 °C and -1.25 A/cm2. A steam supply failure at 4000 h causes certain damage to the cell, resulting in higher degradation in the second half of the one-year period. A degradation-mitigation strategy is successfully tried out by increasing the operating temperature to 836 °C eventually. The test is successfully terminated after reaching one year, demonstrating an average degradation rate of 39 mV/kh over the one-year period. The current work shows the potential of modifying conventional SOEC cells for use in high current density electrolysis applications.
|Number of pages||12|
|Publication status||Published - 2021|
|Event||17th International Symposium on Solid Oxide Fuel Cells - Stockholm, Sweden|
Duration: 18 Jul 2021 → 23 Jul 2021
Conference number: 17
|Conference||17th International Symposium on Solid Oxide Fuel Cells|
|Period||18/07/2021 → 23/07/2021|